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With one week of training camp complete, the next six days take on added significance for Darrell Hazell.

"This is the biggest week for us, maybe since we've been here. This is the week we find out a lot about the football program," Purdue's second-year coach said at Sunday's media day. "This is a tough week. A lot of work has to be done and we'll see things start to mold and shape."

It's time to cut back on exploration and begin to evaluate execution on both sides of the ball, Hazell said. The execution part is critical for Hazell and the coaching staff to truly evaluate personnel instead of adding more.

"We have to find out the top 22 guys on each side of the ball," Hazell said.

Hazell didn't announce the starting quarterback Sunday, and might wait until after Saturday's scrimmage. That is only one position the coaching staff is closely watching as the Boilermakers are three weeks from the Aug. 30 season opener against Western Michigan.

Hazell was pleased with how the first week unfolded.

"Just their attention to detail, their business-like approach and how serious they are about getting better about what they're doing," he said. "You can't ask for anything more than that. Their effort has been tremendous."

On the mend

The Boilermakers avoided major injuries in the first week, but defensive tackle Ra'Zahn Howard (groin) and receiver Dan Monteroso (bruised knee) still remained sidelined.

Howard's injury provided the biggest scare. The 6-foot-3, 323-pound Howard slipped when "I busted through the A gap" during an 11-on-11 drill Wednesday. He was carted off.

"I knew I was OK and I'm a pretty tough person when it comes to stuff like that," Howard said. "I do extra stretches. When I did the split, it would've hurt the average person but I was able to recover."

Howard continues his treatment schedule, which includes a lot of pool work. The New Jersey native doesn't believe he'll lose a step when he returns.

"I can still move and be explosive and change direction and shed blocks," he said.

Knauf full-go

Receiver B.J. Knauf was limited the first week, but said he'll be fully cleared for Monday's two practices.

Knauf suffered a concussion during a 7-on-7 drill in July when "someone got a little rough with me when I burned them on a deep route. He caught up to me and gave me a nice little head shot."

The sophomore didn't want to take any chances since he's dealt with a back injury and underwent a sports hernia operation, missing spring practice.

The Florida native should be in the mix this week. DeAngelo Yancey, Danny Anthrop and Cameron Posey have received a bulk of the snaps with the first-team offense. Freshmen Gregory Phillips and Trae Hart have been part of the rotation.

"I think what I'm seeing is a lot of the bottom guys come up a little bit," Hazell said. "I like that group a lot. I think there's a lot of skill in that room."

Knauf is more than ready to join the group and compete on a full-time basis.

"I had my run of injuries and I feel like it's coming to an end," he said. "My legs feel great. My surgery from last year went well. I was able to work out all summer. I'm a 100 percent. That gave me a head start in May. I'll be ready for the season, no doubt."

More water

Left tackle David Hedelin, a native of Sweden, didn't participate in team drills Saturday but is scheduled to return Monday.

"I just need to drink more water," he said. "My arms are really sore but it's nothing major at all. The weather here is crazy. I have to get used to it."